+/*
+ * PostScript Type 1 font file support for Halibut
+ */
+/*
+ * Type 1 font file formats are specified by Adobe Technical Note
+ * #5040: "Supporting Downloadable PostScript Language Fonts".
+ * Halibut supports hexadecimal format (section 3.1) and IBM PC format
+ * (section 3.3), commonly called PFA and PFB respectively.
+ */
+
+#include <assert.h>
+#include <limits.h>
#include <stdio.h>
+#include <stdlib.h>
#include "halibut.h"
#include "paper.h"
+#define PFB_ASCII 1
+#define PFB_BINARY 2
+#define PFB_EOF 3
+
+typedef struct t1_font_Tag t1_font;
+typedef struct t1_data_Tag t1_data;
+
+struct t1_font_Tag {
+ t1_data *data;
+ size_t length1;
+ size_t length2;
+ filepos pos;
+};
+
+struct t1_data_Tag {
+ char type;
+ size_t length;
+ unsigned char *data;
+ t1_data *next;
+};
+
+typedef struct pfstate_Tag {
+ t1_data *data;
+ t1_data *curblock;
+ size_t offset;
+} pfstate;
+
+static void pf_identify(t1_font *tf);
+
+static t1_data *load_pfb_file(FILE *fp, filepos *pos) {
+ t1_data *head = NULL, *tail = NULL;
+ int c, i;
+ char type;
+
+ pos->line = 0;
+ for (;;) {
+ if (fgetc(fp) != 128) abort();
+ type = fgetc(fp);
+ if (type == PFB_EOF) return head;
+ if (tail) {
+ tail->next = snew(t1_data);
+ tail = tail->next;
+ } else {
+ head = snew(t1_data);
+ tail = head;
+ }
+ tail->type = type;
+ tail->length = 0;
+ for (i = 0; i < 4; i++) {
+ c = fgetc(fp);
+ if (c == EOF) abort();
+ tail->length |= c << (8 * i);
+ }
+ tail->data = snewn(tail->length, unsigned char);
+ if (fread(tail->data, 1, tail->length, fp) != tail->length) abort();
+ }
+ tail->next = NULL;
+}
+
+static t1_data *load_pfa_file(FILE *fp, filepos *pos) {
+ t1_data *ret = snew(t1_data);
+ size_t off = 0, len, got;
+
+ pos->line = 0;
+ ret->type = PFB_ASCII;
+ len = 32768;
+ ret->data = snewn(len, unsigned char);
+ for (;;) {
+ got = fread(ret->data + off, 1, len - off, fp);
+ off += got;
+ if (off != len) break;
+ len *= 2;
+ ret->data = sresize(ret->data, len, unsigned char);
+ }
+ ret->data = sresize(ret->data, off, unsigned char);
+ ret->length = off;
+ ret->next = NULL;
+ return ret;
+}
+
void read_pfa_file(input *in) {
- char buf[512], *p;
+ t1_font *tf = snew(t1_font);
+
+ tf->data = load_pfa_file(in->currfp, &in->pos);
+ tf->pos = in->pos;
+ tf->length1 = tf->length2 = 0;
+ fclose(in->currfp);
+ pf_identify(tf);
+}
+
+void read_pfb_file(input *in) {
+ t1_font *tf = snew(t1_font);
+
+ tf->data = load_pfb_file(in->currfp, &in->pos);
+ tf->pos = in->pos;
+ tf->length1 = tf->length2 = 0;
+ fclose(in->currfp);
+ pf_identify(tf);
+}
+static char *pf_read_token(pfstate *);
+
+/*
+ * Read a character from the initial plaintext part of a Type 1 font
+ */
+static int pf_getc(pfstate *pf) {
+ if (pf->offset == pf->curblock->length) {
+ if (pf->curblock->next == NULL) return EOF;
+ pf->curblock = pf->curblock->next;
+ pf->offset = 0;
+ }
+ if (pf->curblock->type != PFB_ASCII) return EOF;
+ return pf->curblock->data[pf->offset++];
+}
+
+static void pf_ungetc(int c, pfstate *pf) {
+ assert(pf->offset > 0);
+ pf->offset--;
+ assert(c == pf->curblock->data[pf->offset]);
+}
+
+static void pf_rewind(pfstate *pf) {
+ pf->curblock = pf->data;
+ pf->offset = 0;
+}
+
+static void pf_seek(pfstate *pf, size_t off) {
+ t1_data *td = pf->data;
+
+ while (td->length < off) {
+ off -= td->length;
+ td = td->next;
+ }
+ pf->curblock = td;
+ pf->offset = off;
+}
+
+static size_t pf_tell(pfstate *pf) {
+ t1_data *td = pf->data;
+ size_t o = 0;
+
+ while (td != pf->curblock) {
+ o += td->length;
+ td = td->next;
+ }
+ return o + pf->offset;
+}
+
+static void pf_identify(t1_font *tf) {
+ rdstringc rsc = { 0, 0, NULL };
+ char *p;
size_t len;
char *fontname;
font_info *fi;
+ int c;
+ pfstate pfs, *pf = &pfs;
- len = fread(buf, 1, sizeof(buf) - 1, in->currfp);
- buf[len] = 0;
- if (strncmp(buf, "%!FontType1-", 12) &&
- strncmp(buf, "%!PS-AdobeFont-", 15))
+ pf->data = tf->data;
+ pf_rewind(pf);
+ do {
+ c = pf_getc(pf);
+ if (c == EOF) {
+ sfree(rsc.text);
+ error(err_pfeof, &tf->pos);
+ return;
+ }
+ rdaddc(&rsc, c);
+ } while (c != 012 && c != 015);
+ p = rsc.text;
+ if ((p = strchr(p, ':')) == NULL) {
+ sfree(rsc.text);
+ error(err_pfhead, &tf->pos);
return;
- p = buf;
- p += strcspn(p, ":") + 1;
+ }
+ p++;
p += strspn(p, " \t");
len = strcspn(p, " \t");
fontname = snewn(len + 1, char);
memcpy(fontname, p, len);
fontname[len] = 0;
+ sfree(rsc.text);
+
for (fi = all_fonts; fi; fi = fi->next) {
if (strcmp(fi->name, fontname) == 0) {
- fi->fp = in->currfp;
+ fi->fontfile = tf;
+ fi->filetype = TYPE1;
sfree(fontname);
return;
}
}
- fclose(in->currfp);
+ error(err_pfnoafm, &tf->pos, fontname);
sfree(fontname);
}
-
-
+
+/*
+ * PostScript white space characters; PLRM3 table 3.1
+ */
+static int pf_isspace(int c) {
+ return c == 000 || c == 011 || c == 012 || c == 014 || c == 015 ||
+ c == ' ';
+}
+
+/*
+ * PostScript special characters; PLRM3 page 27
+ */
+static int pf_isspecial(int c) {
+ return c == '(' || c == ')' || c == '<' || c == '>' || c == '[' ||
+ c == ']' || c == '{' || c == '}' || c == '/' || c == '%';
+}
+
+static size_t pf_findtoken(t1_font *tf, size_t off, char const *needle) {
+ char *tok;
+ pfstate pfs, *pf = &pfs;
+
+ pf->data = tf->data;
+ pf_seek(pf, off);
+ for (;;) {
+ tok = pf_read_token(pf);
+ if (tok == NULL) {
+ if (pf->offset == 0 && pf->curblock->type == PFB_BINARY)
+ pf->curblock = pf->curblock->next;
+ else
+ return (size_t)-1;
+ } else {
+ if (strcmp(tok, needle) == 0) {
+ sfree(tok);
+ return pf_tell(pf);
+ }
+ sfree(tok);
+ }
+ }
+}
+
+static size_t pf_length1(t1_font *tf) {
+ size_t ret;
+
+ ret = pf_findtoken(tf, 0, "eexec");
+ if (ret == (size_t)-1) {
+ error(err_pfeof, &tf->pos);
+ return 0;
+ }
+ return ret;
+}
+
+static size_t pf_length2(t1_font *tf) {
+ size_t ret;
+
+ if (tf->length1 == 0)
+ tf->length1 = pf_length1(tf);
+ ret = pf_findtoken(tf, tf->length1, "cleartomark");
+ if (ret == (size_t)-1) {
+ error(err_pfeof, &tf->pos);
+ return 0;
+ }
+ return ret - 12 - tf->length1; /* backspace over "cleartomark\n" */
+}
+
+static void pf_getascii(t1_font *tf, size_t off, size_t len,
+ char **bufp, size_t *lenp) {
+ t1_data *td = tf->data;
+ size_t blk, i;
+ char *p;
+
+ while (td && off >= td->length) {
+ off -= td->length;
+ td = td->next;
+ }
+ *bufp = NULL;
+ *lenp = 0;
+ while (td && len) {
+ blk = len < td->length ? len : td->length;
+ if (td->type == PFB_ASCII) {
+ *bufp = sresize(*bufp, *lenp + blk, char);
+ memcpy(*bufp + *lenp, td->data + off, blk);
+ *lenp += blk;
+ } else {
+ *bufp = sresize(*bufp, *lenp + blk * 2 + blk / 39 + 3, char);
+ p = *bufp + *lenp;
+ for (i = 0; i < blk; i++) {
+ if (i % 39 == 0) p += sprintf(p, "\n");
+ p += sprintf(p, "%02x", td->data[off + i]);
+ }
+ p += sprintf(p, "\n");
+ *lenp = p - *bufp;
+ }
+ len -= blk;
+ td = td->next;
+ off = 0;
+ }
+}
+
+void pf_writeps(font_info const *fi, FILE *ofp) {
+ char *buf;
+ size_t len;
+
+ pf_getascii(fi->fontfile, 0, INT_MAX, &buf, &len);
+ fwrite(buf, 1, len, ofp);
+ sfree(buf);
+}
+
+static int hexval(char c) {
+ if (c >= '0' && c <= '9') return c - '0';
+ if (c >= 'A' && c <= 'F') return c - 'A' + 0xA;
+ if (c >= 'a' && c <= 'f') return c - 'a' + 0xa;
+ return 0;
+}
+
+static void pf_getbinary(t1_font *tf, size_t off, size_t len,
+ char **bufp, size_t *lenp) {
+ t1_data *td = tf->data;
+ size_t blk, i;
+ int havenybble = 0;
+ char *p, nybble;
+
+ while (td && off >= td->length) {
+ off -= td->length;
+ td = td->next;
+ }
+ *bufp = NULL;
+ *lenp = 0;
+ while (td && len) {
+ blk = len < td->length ? len : td->length;
+ if (td->type == PFB_BINARY) {
+ *bufp = sresize(*bufp, *lenp + blk, char);
+ memcpy(*bufp + *lenp, td->data + off, blk);
+ *lenp += blk;
+ } else {
+ *bufp = sresize(*bufp, *lenp + blk / 2 + 1, char);
+ p = *bufp + *lenp;
+ for (i = 0; i < blk; i++) {
+ if (pf_isspace(td->data[off + i])) continue;
+ if (!havenybble)
+ nybble = hexval(td->data[off+i]);
+ else
+ *p++ = (nybble << 4) | hexval(td->data[off+i]);
+ havenybble = !havenybble;
+ }
+ *lenp = p - *bufp;
+ }
+ len -= blk;
+ td = td->next;
+ off = 0;
+ }
+}
+
+
+/*
+ * Return the initial, unencrypted, part of a font.
+ */
+void pf_part1(font_info *fi, char **bufp, size_t *lenp) {
+ t1_font *tf = fi->fontfile;
+
+ if (tf->length1 == 0)
+ tf->length1 = pf_length1(tf);
+ pf_getascii(tf, 0, tf->length1, bufp, lenp);
+}
+
+/*
+ * Return the middle, encrypted, part of a font.
+ */
+void pf_part2(font_info *fi, char **bufp, size_t *lenp) {
+ t1_font *tf = fi->fontfile;
+
+ if (tf->length2 == 0)
+ tf->length2 = pf_length2(tf);
+ pf_getbinary(tf, tf->length1, tf->length2, bufp, lenp);
+ if (*lenp >= 256)
+ *lenp -= 256;
+}
+
+static char *pf_read_litstring(pfstate *pf) {
+ rdstringc rsc = { 0, 0, NULL };
+ int depth = 1;
+ int c;
+
+ rdaddc(&rsc, '(');
+ do {
+ c = pf_getc(pf);
+ switch (c) {
+ case '(':
+ depth++; break;
+ case ')':
+ depth--; break;
+ case '\\':
+ rdaddc(&rsc, '\\');
+ c = pf_getc(pf);
+ break;
+ }
+ if (c != EOF) rdaddc(&rsc, c);
+ } while (depth > 0 && c != EOF);
+ return rsc.text;
+}
+
+static char *pf_read_hexstring(pfstate *pf) {
+ rdstringc rsc = { 0, 0, NULL };
+ int c;
+
+ rdaddc(&rsc, '<');
+ do {
+ c = pf_getc(pf);
+ if (c != EOF) rdaddc(&rsc, c);
+ } while (c != '>' && c != EOF);
+ return rsc.text;
+}
+
+static char *pf_read_word(pfstate *pf, int c) {
+ rdstringc rsc = { 0, 0, NULL };
+
+ rdaddc(&rsc, c);
+ if (c == '{' || c == '}' || c == '[' || c == ']')
+ return rsc.text;
+ for (;;) {
+ c = pf_getc(pf);
+ if (pf_isspecial(c) || pf_isspace(c) || c == EOF) break;
+ rdaddc(&rsc, c);
+ }
+ if (pf_isspecial(c)) pf_ungetc(c, pf);
+ return rsc.text;
+}
+
+static char *pf_read_token(pfstate *pf) {
+ int c;
+
+ do {
+ c = pf_getc(pf);
+ } while (pf_isspace(c));
+ if (c == EOF) return NULL;
+ if (c == '%') {
+ do {
+ c = pf_getc(pf);
+ } while (c != 012 && c != 015);
+ return pf_read_token(pf);
+ }
+ if (c == '(') return pf_read_litstring(pf);
+ if (c == '<') return pf_read_hexstring(pf);
+ return pf_read_word(pf, c);
+}
~mdw / sgt / halibut / blobdiff